Base for self-contained hydraulic motors



March I, 1949. s c 2,463,003

BASE FOR SELF-CONTAINED HYDRAULIC MOTORS Filed May 14, 1945 r PatentedMar. 1, 1949 UNITED STATES BASE FOR SELF-CONTAINED HYDRAULIC MOTORSThomas F. Stacy, Piqua, Ohio, assignor to The French Oil Mill MachineryCompany, Piqua,

Ohio

Application May 14, 1945, Serial No. 593,630

4 Claims.

This invention relates to hydraulic motors and more particularly to thetype popularly known as the self-contained motors, where the hydraulicmotor, pump, valves and hydraulic system are all assembled in a devicethat may be handled as a complete unit. Heretoiore hydraulic motors ofthis type utilized as molding presses have had the cylinder with theadvancing and retracting chambers, through pressure differentials inwhich the ram is operated, disposed with all of the valves, pump andpiping in the reservoir that formed the base of the unit or press, sothat any leakage in the system was directly into the reservoir where itdid no harm. The major part of the adjustments and maintenance workrequired on these presses was in connection with the valves, and whenservicing of the valves, piping or pump was required, it was necessaryto empty the reservoir of the oil. A workman doing the servicing was notonly handicapped by the film of oil that remained on the exterior of allthe parts being serviced, but there was substantial danger that theworkman would get dirt and other foreign matter into the oil or residueof the oil remaining in the reservoir, which, if taken up in the systemand carried to different parts of the apparatus, might cause scoring ofrelatively moving, interfitting parts or other damage.

An object of this invention is to provide an improved, self-contained,hydraulic motor or press in which any or all of the control valves, pumpand connections may be disposed exteriorly of the reservoir and normallyconcealed within the housing forming the base where leakage may becollected; with which all of such concealed parts will be readilyavailable for servicing and inspection without the servicing mechanicbeing usually smeared with oil, and with a minimum danger of dirt orforeign matter getting into the operating fluid of the system; withwhich it will not be necessary to empty the reservoir of the operatingoil when the servicing of such control valves, piping or connections andpump becomes necessary; with which leakage may be collected and filteredbefore being returned to the system, and which will be relativelysimple, compact and inexpensive.

Other objects and advantages will be apparent from the followingdescription of anembodiment of the invention, and the novel featureswill be particularly pointed out hereinafter in connection with theappended claims.

In the accompanying drawings:

Fig. 1 is a perspective of a self-contained molding press constructed inaccordance with, and representing one embodiment of the invention;

Fig. 2 is a sectional plan of the same;

Fig. 3 is a similar sectional plan, of another embodiment of theinvention, with the pump disposed outside of the housing; and

Fig. 4 is a section plan of another embodiment of the invention.

In the embodiment of the invention illustrated in Figs. 1 and 2, theself-contained hydraulic motor is incorporated in a hydraulic moldingpress of the type disclosed in my prior Patent #2358353, granted Sept.19, 1944. In that patent the pump and all of the valves are disposed inthe hollow base which acts as the reservoir. In the present inventionthe press includes a hollow base or housing I!) which is liquid-tight onits side and bottom walls and which has, extending upwardly through itstop wall, a hydraulic ram l l surrounded by a packing gland i 2 where itemerges from the base Ill. The upper end of the ram II is connected toand operates a platen l3 which is guided, by vertical strain rods I l,toward and from a head l5.

Within the housing l0, and connected to the packing gland I2, is ahydraulic cylinder l6, Fig. 2, having a pilot operated prefill valve I!which opens into the space surrounding the cylinder l6. Secured to oneside of the cylinder 16 is a valve plate I8, which is removably coupledto the cylinder I6 and also removably coupled by screws lfi to aninternal flange 20 provided on the side and bottom walls of the housingII]. A gasket 2! is disposed between the valve plate l8 and the flange29 to make a liquid-tight connection between them. This valve plate I8,with the flange 29, thus provides a partition or wall across theinterior space of the housing I0, and divides it into twonon-communicating compartments 22 and 23, in one of which is disposedthe cylinder l6 with its prefill valve, and in the other of which thecontrol valves 25 are disposed, and if desired also the pump 24. Thecontrol valves 25 are preferably mounted on the valve plate l8, and thepump 24, either within or exteriorly of the housmg.

An electric motor 26 is coupled to the outside of a wall of housing I8,and its armature shaft is coupled to and directly drives the pump. Thepump is connected by suitable piping 2! to the valves and the advancingand retracting chambers of the cylinder E6 to form a hydraulic operatingsystem ofany suitable type, one of which is illustrated in Fig. 1 of myprior Patent #2,358,353, to which reference may be had for a detailedillustration description of one type of hydraulic system that may beemployed.

The housing It is provided at its top with a removable closure 28, seeFig. 1, through which access may be had to the compartment 23 throughthe top thereof, and is also provided with removable plates 29 on theopposite side walls, so that access may be had to the compartment 23through these openings in the sides and top of the housing. Theoperating oil is all contained in the system and in the compartment 22.Any leakage through age has collected in the bottom of this c'ompartment 23, it may be removed through a suitable drain valve, not shown,filtered if necessary :to remove foreign matter, and returned tozthe=reservoir compartment 22. When servicing of the hydraulic system isrequired, access :to the control valves, pipes and pump may be easilyhad through the openings in the top and side walls of the housing It),and the workman will not have to handle :parts covered with films ofadheringoil as in previous instances. The danger of foreign matter beingintroduced into the oil by the workman is also reduced to a minimum, ifnot entirely eliminated.

In the embodiment of the invention illustrated 13, the arrangement isgenerally similar to that shown in'Fig. ;2, and corresponding parts areiven the same reference characters, the difference being that in theexample shown in Fig. 3, the pump is disposed exteriorly of the housingit, but mounted on the end wall with the motor, a d connected bypipesextending throughthe end Wall t the valves and cylinder chambers.

the embodiment of the invention illustrated in Fig. 4, the housing .01base I 0 is extendedhorizpntallyin the opposite direction from thecylinder l6 so as to provide asecond compartment 30. Apartitionplatefilisdisposed across the interior of the housing l0 and detachably coupledto an 3 internal flange 32, which .extendsalong the sides and bottom .ofthe-interior of the housing l 0, with a. gasket interposed "between theplate 3t and the flange 132,,so .as to prevent leakage of oil from thereservoir chamber surrounding the cylinder it into the chamber 30. Thehousing ll) may have removable plates 33 secured across and closingwindows 34in one or more side walls of the housing 1 0, so as to provideample access to the chamber, and the top wall of the housing may, ifdesired, also have a removable top plate, notshown, similar to theremovable top 28 at the opposite end of the housing H1.

The pump 24' may be disposed in the chamber 30 and driven by the motor2-6 mounted on the s exterior of the end wall of the housing ll!adjacent =the--pump. Thus the pump will be disposed in a separatechamber to which access may be had for servicing through the removal ofplates on the sides and top of that end of the housing.

In the chamber 23 at the opposite end of the housing, the valves 25 m ybe disposed, as in the other embodiments of the invention. With thisrrangement, m re convenient a ess ay be had o th alves in the chambe s2, wit out int ierenc .i om he p mnam simila ly more couven en acces mab h d t t pum in t s pa ate ompartment.-

1 have round tha the adjustments and ost o the ntenance work in. thesesell-contained mold ng p ess s c nnect on wi the a ves, and. n all ofthe embodim s of the. invention. he valves ar isolated in a chamberseparate from the res rvoi s at hen servi ing on the val e i required.tis n ec s ry t emo e nd store the. operating iquid. and the danger osetting out or forei n matter. into the oil while working on orseryicing the valves is largely eliminated. The time requiredto servicesuch a press is thus greatly reduced. The pump may be-left in thereservoir, if desired, because servicing of the pump is relativelyinfrequent in comparison with the frequency of servicing required forthe valves. By removing the pump from the reservoir, servicing of thepump, when required, is more easily made, and inasmuch as there islittle leakage from the pump, the pump can, if desired, be removedentirely from the housing [I] and mounted on the top or any of thesidewalls of the housing It.

It will be understood that various changes in the details, materials,and arrangements of parts, which have been herein described andillustrated in order to explain the nature of the invention, may be madeby those skilled in the art within the principle and scope of theinvention, as expressed in the appended claims.

I claim:

1. In a self-contained, hydraulic motor of the type having a reservoir,2. pump, a cylinder having a prefill valve and advancing and retractingchambers disposed within said reservoir, a ram operated by pressurediiferentials in said chambers, a plurality of control valves, andconnections between the valves, pump, reservoir and chambers and formingan operating hydraulic system by which the movements of said ram arecontrolled, that improvement which comprises an upright, separate plateWithin said reservoir, coupled to the side and bottom walls thereof andto a side of said cylinder, forming a liquidtight partition across theinterior of said reservoir at one sde of said cylinder, and dividing thereservoir into two horizontally side by side, non-communicatingcompartments, with said cylinder and its prefill valve in one of saidcompartments and serving as the reservoir and into which said prefill.valve opens, and said control valves in the other of said compartmentswhere they will be free of external oil and exposed for easy servicing.

2. In a self contained, hydraulic motor of the type having in its base areservoir, a pump, a

cylinder having a prefill valve and advancing and retracting chambersdisposed in said reservoir, a ram operated by pressure differentials insaid chambers, a plurality of control valves, and connections betweenthe valves, pump, reservoir and chambers and forming an operatinghydraulic system by which the movements of said ram are controlled, thatimprovement which comprises an upright, separate, added, partition wallacross the interior of said reservoir at one side of said cylindercoupled and sealed to the side and'bottom walls of said reservoir, anddividing said interior into two non-communicating, horizontally, side byside compartments, one of which contains said cylinder and its prefillvalve and serves as said reservoir, and the other contains said controlvalves and said pump, whereby said control valves and pump will beoutside of said compartment carrying operating oil and exposed foreasier servicing without emptying of the reservoir compartment, andcontamination of the oil by servicing operations will be reduced.

'3. In a self-contained, hydraulic motor of the type having a base witha chamber serving as a reservoir, a pump, a cylinder having a prefillvalve and advancing and retracting chambers disposed in said reservoir,a ram operated by pressure differentials in said chambers, a pluralityof control valves, and connections between the valves, pump,1reservoirand chambers and forming an operating hydraulic system by which themovements of said ram are controlled, thatimprovement which comprises anupright, separate additional partition wall inserted in and extendingacross the interior of said reservoir at one side of said cylinder,coupled and sealed to the side and bottom walls of the reservoir anddividing said interior into two non-communicating, horizontally, side byside compartments, one of which contains said cylinder and serves assaid reservoir, and the other contains said control valves, and saidbase having openings in its walls leading directly to said othercompartment and removable closures for said openings, whereby saidcontrol valves will be outside of said compartment carrying operatingoil and exposed for easier servicing Without emptying of the reservoircompartment, and contamination of the oil by servicing operations willbe reduced.

4. In a self-contained hydraulic motor of the type having in its base areservoir housing, a cylinder with advancing and retracting chambers anda prefill valve disposed in said housing, a ram operated by pressuredifierentials in said chambers extending out of said housing, a pump, avalve plate secured to the side of said cylinder, a plurality of controlvalves mounted on said plate, and connections between the valves, pump,reservoir and chambers, and forming an operating hydraulic system bywhich the movements of said ram are controlled, that improvement whichcomprises said valve plate engaging and sealed to the side and bottomwalls of the housing and dividing the interior of said housing into twonon-communicating compartments, with said cylinder and its prefill valvein one of said compartments, and said control valves in the other ofsaid compartments, whereby said control valves will be unsubmerged inoil and exposed for easier servicing without emptying of the reservoircompartments surrounding the cylinder, and contamination of the oil byservicing operations will be reduced.

THOMAS F. STACY.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

